• AOL TV, Friday, July 15, 2011 3:01 PM

To promote the off-network run of CBS' "The Big Bang Theory," which starts Sept. 18 nationally over TBS and locally via Fox-owned and other stations, Warner Bros. has released a new two-minute music video of the show's theme song by the Barenaked Ladies.

Featuring the show's cast members as well as the band, the video -- titled "5 Nights a Week," will also serve as an extra on a fourth season DVD out on Sept. 13. A full-length version of the song is promised for a new Barenaked Ladies greatest hits album.

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